// Evenly distributes the colors provided between 0 and 1
public ColorScale(IEnumerable <Color> colors)
{
if (colors == null)
{
throw new ArgumentNullException("colors");
}
int count = colors.Count();
_stops = new ColorScaleStop[count];
int index = 0;
foreach (Color color in colors)
{
// Clean up floating point jaggies
if (index == 0)
{
_stops[index] = new ColorScaleStop(color, 0);
}
else if (index == count - 1)
{
_stops[index] = new ColorScaleStop(color, 1);
}
else
{
_stops[index] = new ColorScaleStop(color, (double)index * (1.0 / (double)(count - 1)));
}
index++;
}
}
public ColorScale(IEnumerable <ColorScaleStop> stops)
{
if (stops == null)
{
throw new ArgumentNullException("stops");
}
int count = stops.Count();
_stops = new ColorScaleStop[count];
int index = 0;
foreach (ColorScaleStop stop in stops)
{
_stops[index] = new ColorScaleStop(stop);
index++;
}
}
public ColorScale Trim(double lowerBound, double upperBound, ColorScaleInterpolationMode mode = ColorScaleInterpolationMode.RGB)
{
if (lowerBound < 0 || upperBound > 1 || upperBound < lowerBound)
{
throw new ArgumentException("Invalid bounds");
}
if (lowerBound == upperBound)
{
return(new ColorScale(new Color[] { GetColor(lowerBound, mode) }));
}
List <ColorScaleStop> containedStops = new List <ColorScaleStop>(_stops.Length);
for (int i = 0; i < _stops.Length; i++)
{
if (_stops[i].Position >= lowerBound && _stops[i].Position <= upperBound)
{
containedStops.Add(_stops[i]);
}
}
if (containedStops.Count == 0)
{
return(new ColorScale(new Color[] { GetColor(lowerBound, mode), GetColor(upperBound, mode) }));
}
if (containedStops.First().Position != lowerBound)
{
containedStops.Insert(0, new ColorScaleStop(GetColor(lowerBound, mode), lowerBound));
}
if (containedStops.Last().Position != upperBound)
{
containedStops.Add(new ColorScaleStop(GetColor(upperBound, mode), upperBound));
}
double range = upperBound - lowerBound;
ColorScaleStop[] finalStops = new ColorScaleStop[containedStops.Count];
for (int i = 0; i < finalStops.Length; i++)
{
double adjustedPosition = (containedStops[i].Position - lowerBound) / range;
finalStops[i] = new ColorScaleStop(containedStops[i].Color, adjustedPosition);
}
return(new ColorScale(finalStops));
}
public ColorScaleStop(ColorScaleStop source)
{
Color = source.Color;
Position = source.Position;
}